Process for chemical vapor purification of group IIIA metal fluo

Details Process for chemical vapor purification of group IIIA metal fluo Process for chemical vapor purification of group IIIA metal fluo

1991-01-31

1993-08-17

Niebling, John

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

423DIG12, C01B 908

Patent

active

052366901

ABSTRACT:
A chemical vapor purification process for preparing metal fluorides. The process involves melting a metal selected from the metals forming fluorides suitable for use in fluoride glass and thermodynamically partitionable from cation contaminants, for example aluminum, gallium, or indium. Chlorine, bromine, or iodine is bubbled through a stoichiometric excess of the melt, under reaction conditions selected to result in generation of a gaseous halide of the metal. The gaseous halide is then isolated from the melt and reacted with a gaseous fluorinating agent to form a solid fluoride of the metal.

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